Real-time auralization of time-varying sound fields with moving sound sources and listeners

通过移动声源和听众实时听出时变声场

• 批准号: 244441867
• 负责人: Professor Dr. Michael Vorländer
• 金额: --
• 依托单位: Lehrstuhl und Institut für Hörtechnik und Akustik (IHTA)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/244441867?language=en
• 关键词: Real; time; auralization; varying; sound

This research proposal deals with the real-time auralization of acoustic virtual scenes with fast moving sound sources and listeners. In recent years, sophisticated methods were developed, which allow the physically-based simulation of acoustics in real-time (geometrical acoustics, diffraction models, sound transmission models, etc.). Moving sources and listeners and the resulting Doppler effects have been simulated using simplified approaches only. In case of large distances between sources and listeners, these methods fail to simulate the sound propagation in a plausible way and free of artifacts. Trajectories of moving objects can be altered during runtime only to a limited degree, which puts a strong limitation on the interaction in virtual environments.Based on our long-term experience in this scientific domain, the aim of this project is to enhance recent approaches and to develop new real-time simulation methods for fast moving sources and listeners. The objective is not only to perform the auralization in real-time, enabling a passive listening experience in the virtual scene, but especially to focus on the user interaction, which is essential for Virtual Reality. Movements (trajectories) of all objects in the scene should be modifiable by the user in real-time. In order to achieve this goal new scientific findings are needed in the following areas: a) real-time motion modeling, b) physically-correct computation of sound propagation times in real-time and c) consideration of the temporally-correct parameters in the auralization, which demands the description of the variables in a virtual scene along a temporal history. These results will then be combined into a unified auralization approach. This requires not only an understanding of these individual fields, but also of their distinct interdependencies (motion modeling, sound propagation, scene data structures).The obtained scientific results will be implemented into the existing RWTH Aachen real-time auralization system, enabling it to serve as a tool for enhanced studies in the future (e.g. comprehensive noise scenarios in urban surroundings). The potential sound sources regarded in this project are cars, high-speed trains and aircrafts. Especially for noise research, like traffic and aircraft planning, such virtual environments could prove as a beneficial tool in the future.The initial two-year funding period is needed for the development of all required foundations and the implementation of the software tools. A subsequent third year is dedicated to subjective user studies with statistical psychoacoustic assessments. Here, the potential methods and parameters shall be compared in detail in order to optimize them for the application.

该研究方案涉及具有快速移动的声源和听者的声学虚拟场景的实时可听化。近年来，发展了复杂的方法，使得基于物理的实时声学模拟(几何声学、绕射模型、声传输模型等)成为可能。移动的声源和监听者以及由此产生的多普勒效应仅使用简化的方法来模拟。在声源和听者之间距离较大的情况下，这些方法不能以可信的方式模拟声音的传播，并且没有伪影。移动对象的运动轨迹在运行过程中只能有限地改变，这对虚拟环境中的交互有很大的限制，基于我们在这一科学领域的长期经验，本项目的目的是改进现有的方法，并开发新的实时模拟方法来适应快速移动的信源和监听者。目标不仅是实时执行可听化，实现虚拟场景中的被动收听体验，而且特别关注用户交互，这对虚拟现实至关重要。场景中所有对象的运动(轨迹)应可由用户实时修改。为了实现这一目标，在以下领域需要新的科学发现：a)实时运动建模，b)实时物理校正声音传播时间的计算，以及c)在可听化中考虑时间校正参数，这要求沿着时间历史描述虚拟场景中的变量。这些结果将被合并到一个统一的可听化方法中。这不仅需要了解这些单独的领域，还需要了解它们不同的相互依赖关系(运动建模、声音传播、场景数据结构)。所获得的科学成果将被应用到现有的RWTH Aachen实时可听化系统中，使其能够作为未来加强研究的工具(例如，城市环境中的综合噪声场景)。这个项目考虑的潜在声源是汽车、高铁和飞机。特别是对于噪音研究，如交通和飞机规划，这种虚拟环境在未来可能被证明是一个有益的工具。最初的两年资助期需要发展所有必要的基础和实施软件工具。随后的第三年致力于通过统计心理声学评估进行主观用户研究。在此，应对可能的方法和参数进行详细比较，以便针对应用进行优化。